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| Effect of combination of rice-straw biochar and Pennisetum sinese on remediating Cu and Cd contaminated soil |
| Received:July 28, 2020 |
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| KeyWord:combined remediation;rice-straw biochar;joint pollution of Cu and Cd;Pennisetum sinese;absolute enrichment amount;marginal remediation efficiency |
| Author Name | Affiliation | E-mail | | WANG Xi-yang | Research Institute of Poyang Lake, Jiangxi Academy of Sciences, Nanchang 330096, China
Jiangxi Engineering and Technology Research Center of Eco-remediation of Heavy Metal Pollution, Nanchang 330096, China | | | XIN Zai-jun | Research Institute of Poyang Lake, Jiangxi Academy of Sciences, Nanchang 330096, China
Jiangxi Engineering and Technology Research Center of Eco-remediation of Heavy Metal Pollution, Nanchang 330096, China | | | LI Xiao-hui | Research Institute of Poyang Lake, Jiangxi Academy of Sciences, Nanchang 330096, China
Jiangxi Engineering and Technology Research Center of Eco-remediation of Heavy Metal Pollution, Nanchang 330096, China | | | LI Liang | Research Institute of Poyang Lake, Jiangxi Academy of Sciences, Nanchang 330096, China
Jiangxi Engineering and Technology Research Center of Eco-remediation of Heavy Metal Pollution, Nanchang 330096, China | | | SUN Xiao-yan | Research Institute of Poyang Lake, Jiangxi Academy of Sciences, Nanchang 330096, China
Jiangxi Engineering and Technology Research Center of Eco-remediation of Heavy Metal Pollution, Nanchang 330096, China | | | MIN Fang-fang | Jiangxi Institute of Analysis and Test, Nanchang 330029, China | mff823348915@163.com |
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| Abstract: |
| Herein, a field plot experiment was conducted to investigate the effect of rice-straw biochar application on the Pennisetum sinese remediating the Cu- and Cd-contaminated soil by setting up different application amounts of rice-straw biochar(0, 5 000, 10 000, 15 000 kg·hm-2, and 20 000 kg·hm-2), with an aim to evaluate the potential and advantage of the combined remediation of rice-straw biochar and Pennisetum sinese. The results showed that the rice-straw biochar application significantly increased the survival and shoot biomass of Pennisetum sinese in the Cu- and Cd-contaminated soil. Furthermore, the application decreased the available Cu and Cd and the total Cd in soil, and lowered the Cu bioconcentration to some extent; however, it increased the Cd bioconcentration in the Pennisetum sinese. The 5 000 kg·hm-2 biochar treatment made the biggest Cd gains in root, stem, and leaf of Pennisetum sinese, wherein the increases were 60.75%, 230.31%, and 83.34%, respectively. Additionally, the biochar application significantly promoted the absolute enrichment of Cu and Cd in Pennisetum sinese shoot, wherein the biggest increases were up to 3 741.04 g·hm-2 with a 10 000 kg·hm-2 treatment and 167.81 g·hm-2 with a 5 000 kg·hm-2 treatment, respectively. Results suggest that 5 000 kg·hm-2 of rice-straw biochar application amount is more economical and effective according to the marginal efficiency of remediation. The application of rice-straw biochar enhanced the bioconcentration level of the Cu and Cd in the Pennisetum sinese shoot and showed a great remediation potential for Cu- and Cdcontaminated soil. |
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